Re: OOT:Power Quality in Data Center

Nice post and gadget Christopher!

Do you perhaps know how datacenters protect against the 'blind
current/reactive power'?

Thanks!

2009/12/24 Christopher Copley <copley.chris_at_gmail.com>

> Depends on that you define as quality power. There are a few ways to define
> that...
> 1. How clean is your power (conditioning)
> 2. Constant flow from a commercial source
> 3. Back up power operations
>
> The above are just a few things that can fall in that definition.
> You can always get an amprobe, and that can tell you your amperage,
> voltage,
> watts, etc. I personally have an amprobe and a device called a killowatt. (
> http://www.thinkgeek.com/gadgets/travelpower/7657/ ) But you really need
> to understand electric to understand what it is all telling you.
>
> As a Cisco tech I personally would recommend to a client to call a
> certified
> electrician, one that specializes in data center power. Depending on how
> larger the Data Center is they might have an electrician on call. (it is
> better to let a rack of gear fail, than to kill your self)
>
> My personal saying IMHO, if you do not understand electricity don't even
> pretend to talk to a client about it or even touch it EVER. Typically
> Data
> Centers have high voltage feeds to most racks (120 and above)
>
> I can not stress it enough... It is a VERY VERY VERY dangerous thing and
> can
> bit you hard and fast in many many many ways. I work for an power
> distribution manufacturer and nearly every employee is an electrical
> engineer or certified electrician, and they always stress, let the pro's
> handle the stuff that can kill you.
>
> Please keep in mind this is all IMHO,
>
> HTH
> Chris
>
>
>
> On Thu, Dec 24, 2009 at 1:45 PM, ospfv2 <ospfv2_at_gmail.com> wrote:
>
> > the scenario
> >
> > you arrived in data center,
> > you plug your laptop adaptor into rack PDU,
> > your touch-pad pointer going crazy.
> > so you grab a usb-mouse & connect it to your laptop.
> >
> >
> > then your cisco switch doesn't function properly,
> > it was ok when you configure it in the office.
> >
> > have you ever encounter this issue ?
> >
> > some people told me it was harmonic problem
> > some said it was grounding problem
> > any idea ?
> > is there any tools to measure the power quality
> > before the customer ask me to replace the whole rack and switches
> >
> >
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-- 
Wouter Prins
wp_at_null0.nl
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